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This Question is Answered 1 Helpful Answer available (2 pts)
761 Views 4 Replies Latest reply: May 2, 2012 4:19 PM by DEEPAK ARORA RSS

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Configure frame-relay

Apr 13, 2012 4:31 PM

Sampath Weerasinghe - CCIE 203 posts since
Oct 3, 2009

What is the best way to configure this network (dynamic inverse arp not allowed)


Option 1 (my option):

   on R2,R4 multiple frame-relay map's on physical interface

   on R5,R6 a single frame relay map on each physical interface


Option 2 (workbook suggested answer):

   on R2,R4  frame-relay interface-dlci command on two point-to-point subinterfaces

   on R5,R6  a single frame relay map  on each physical interface





  • Keith Barker - CCIE RS/Security, CISSP 5,327 posts since
    Jul 3, 2009
    Currently Being Moderated
    Re: Configure frame-relay

    Hello Sam-


    For basic connectivity, before considering routing protocols, both options can provide the same connectivity. 


    Some of the other factors that may go into the design would include which routing protocols are being used, and network types that are allowed or not allowed to be configured.


    With the sub-interface option, split horizon issues could be avoided, however, if the main interface is used, EIGRP split horizon could be disabled, which would solve that problem (if EIGRP was being used).


    Hope that helps,


    Keith Barker

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  • Martin 13,910 posts since
    Jan 16, 2009
    Currently Being Moderated
    Re: Configure frame-relay

    Recommended or suggested way of setting up FR is using p-t-p subinterfaces whenever you can;


    for those who are getting multiple DLCIs, you must assign one DLCI per PVC,

    either frame-relay interface-dlci or frame map ip will work on sub-interfaces; it depends on your type of sub-interfaces (multi-point or p-t-p), which may depend on type of topology used: full-mesh or partial mesh and IP scheme.


    So, I like their option of p-t-p subinterfaces as it gives you more flexibility of adding more PVCs later (as opose to tearing all down and re-building)


    Closer look at picture, I can see now that R6 is directly connected to R4, which is spoke  for  R2, so likely you want to keep the R4-R6 on separate subnet form R4,R2,R5; separate subnet = PVC =point-to-point sub-interfaces.


    Message was edited by: Martin

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  • DEEPAK ARORA 834 posts since
    Sep 23, 2009
    Currently Being Moderated
    Re: Configure frame-relay

    Hmmm...Looks like IP Expert Vol 3 Workbook


    But otherwise what's your opinion on using PPP Over FR here ?




    Deepak Arora

    Evil CCIE

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